bugtraq - Re: Denial of Service Vulnerabilities in TrueCrypt 4.3 Linux (re. bid 23180)

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Message-ID: <20070401164722.31F1.0@paddy.troja.mff.cuni.cz>
Date: Sun, 1 Apr 2007 16:58:47 +0200 (CEST)
From: Pavel Kankovsky <peak@...o.troja.mff.cuni.cz>
To: Tim Rees <timrees1@...il.com>
Cc: bugtraq@...urityfocus.com
Subject: Re: Denial of Service Vulnerabilities in TrueCrypt 4.3 Linux (re.
 bid 23180)

On Wed, 28 Mar 2007, Tim Rees wrote:

> All other system binaries (e.g. screen etc.) are now inaccessible, but
> if a user (or root) runs sudo (or whatever the user names it) in the
> meantime before someone realises something is wrong, the malicious
> binary will be executed.

You do not have to rely on some other user running your trojan horse. You
can replace a program run automatically (e.g. by cron). Or something even
better: replace system dynamic libraries (e.g. /lib/tls) and run a
dynamically linked setuid program of your own choice. Instant ownage!
(Moreover, the latter approach is quite easy to exploit without making the
system unusable.)

This is a very serious vulnerability.

--Pavel Kankovsky aka Peak  [ Boycott Microsoft--http://www.vcnet.com/bms ]
"Resistance is futile. Open your source code and prepare for assimilation."